Remove Valves
1. Thoroughly clean lapping compound from valve seat and
valve face.
1.
2.
Place cylinder head on work surface.
2.
Valve seat width should be as shown in Fig. 53.
Remove valve cap from valve stems, Fig. 52.
2
4
45
°
2
1
1
3
Fig. 53 – Valve and Seat Dimensions
1.
2.
3.
Margin
4.
Valve seat width minimum
3/64–1/16” (1.17–1.57mm)
1/32” (.79mm) fit for use
1/64” (.38mm) discard
3.
4.
If seat is wider, a narrowing cutter should be used. If valve
face is badly burned, the burned valve should be replaced.
Fig. 52 – Removing Valves
1.
Valve spring retainer
2. Valve cap
Replace valve if margin is 1/64 inch (.39mm) or less or
damaged, Fig. 53.
3.
With thumbs, press down on valve spring retainer and
spring to compress until large end of slot in retainer can
line up with end of valve stem, Fig. 52.
If seats are burned or damaged, replace cylinder head.
Assemble Cylinder Head
4.
5.
Release pressure on retainer and spring.
Install Cylinder Head Plate and
Rocker Arm Studs
Remove retainer, spring, and intake valve seal, if removing
intake valve, Fig. 52.
1.
Place new cylinder plate gasket and cylinder head plate on
cylinder head.
Inspect Valve Guides
1.
2.
3.
Measure intake and exhaust valve guides using Briggs &
Stratton Tool #19122.
2. Install and torque two (2) cylinder plate screws to
80 in. lbs. (9.0Nm), Fig. 54.
If flat end of gauge can enter guide for 1/4” (6.35mm) or
more, cylinder head must be replaced.
1
If plug gauge is not available, refer to Table No. 1,
Page 32 for reject size.
Valve Service
Reface Valves and Seats
Although valve faces can be resurfaced on a commercially
available valve grinding tool, we do not recommend this
practice as a high quality repair procedure. Valve replacement
is recommended for damaged or worn valves. Valve seats are
cut using Briggs & Stratton Tool #19237 or #19343, Neway
Valve Seat Cutter Kit, to 45° on exhaust and some intake
seats. Other intake seats are cut to 30°. Valve and seat are
lapped in using Briggs & Stratton Tool #19258, Valve Lapping
Tool, and Briggs & Stratton Part #94150, Valve Lapping
Compound, to assure a good seal between the valve face and
the seat.
Fig. 54 – Installing Cylinder Head Plate
1.
Screw: torque to 80 in. lbs. (9.0Nm)
GTS 200
29
Compression
| Categories | Lawn Mower Manual, Parts and Accessories Manuals, Toro Lawn Mower Manual |
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| Tags | Toro GTS 200 |
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| Language | English |
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